Can I jump to the previous/next keyframe but ignore Grease Pencil keyframes?
By default blender 2.8 doesnt show greasepencil keyframes in the timeline viewer.

I found out in this post  that the keyframes a bit iffy on greasepencil in 2.8 but if you want to see them use the dopesheet instead of the timeline as the keyframe viewer. You can use up/down arrow keys to navigate between keyframes there.

You can do a dual split to have both dopesheets or a dopesheet/timeline to see both.


If your selected on a GreasePencil object... up/down will go through GP keyframes
If selected on a regular dopesheet object (e.g. mesh , curve etc...) up/down will go through normal frames.